Guide for power hammers



Sept; 30 1924.

T. ANDER$EN GUIDE FOR POWER HAMMEHS H W W N T S R NR 0 w m w A N N l A MW n. W E .T G

Fil od March 6 Patented Sept. 30, 19.24%.

UNITED STATES earner orrlce.

GUIDE FOR, POWER,

Application filed March 6, 1922;.

To all whomit may concern:

Be it known that I TnNenL ANnERsnN, a citizen of the United States, residing at 14 Grove Place, Port Richmond. county of Richmond, and State of New York, have invented certain new and useful Improvements in Guides forPower Hammers, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to a lead or guide for a movable body and relates more particularly to a guide for confirming the movement of a suspended power hammer in a rectilinear path.

Power hammers have proven of great value for driving piling and when. employed for this purpose are usually suspended by means of a cable from the end of a boom.

The hammer is then carried by the boom to an operative position with respect to a pile, whereupon the pile and hammer are so juxtaposed that an actuation of the hammer effects a succession of blows upon the pile with the result that the pile is driven into the ground.

As the pile moves downwardly the hammer must necessarily follow, the downward movement of the hammer being permitted by the manipulation of the drum upon which thecable, supporting the hammer. is wound. p

Steam or pneumatic hammers for pile driving purposes are cumbersome bodies and essentially of great weight. It therefore becomes necessary to provide a guide or lead which willconfine the vertical movement of the hammer to a given path and thus facilitate its guidance throughout its movement between the boomand the ground or body into which a pile is to be driven.

An object of the present invention is to provide aguide which may he so associated with a hammer as to 'Inaintain its move ment substantially unidire'ction ally through outitslengthpf travel; "Another'objectbfthe invention is to ro'' vide; a guide so constituted that it may be readily adjusted to control the movement of the hammer when" the distance of travel of thesaidaharhmerisvaried; H th er objects and advantages; will he ap-j Serial No. %,462.

parent upon a reading of the following specification. and by reference to the accompanying drawings in which Fig. 1 shows my guide as applied to a. steam hammer.

F 2 is an elevational view of the guide partly in section.

Fig. is another elevational view partly in section.

Fig. 4 is a view taken on line IVIV in Fig. 2.

Fig. 5 is a side view of one of the yokes for connecting the guide member with the hammer and Fig. 6 is a section taken on line VIVI in Fig. 5. I

l\. [y improved lead or guide may comprise a plurality of sections capable of relative movement to produce a variation in the length of the guide. These sections are preferably of tubular form and concentrically disposed and adapted to be collapsed or expanded at will. The guide is provided at its upper end with means for detachably connecting it to the end of a boom and at its lower end with a suitable tip or nose piece to facilitate its insertion into the ground or other body.

Referring now to the drawing the embodiment of my invention shown may consist of guide comprising two sections or members 10 and 11. The inside diameter of the member 10 is of such dimension as to provide a sliding fit for the section 11 which is inserted therein. It will thus be seen that the sections are relatively movable and aguide so constituted may be lengthened or shortened by collapsing or nesting the two sections.

The normal upper end of the section 1:0 is provided with a yoke or shackle 12 pivoted on a bolt 13 which' extends transversely through the section 10. Positioned within the yoke is a sheave 14 mounted on a shaft 15 whiclrhas'its'bearing in the 'sidesof the o'ke fl h H L E VHLHE EOE. The sheave "14 is" provided to guide a"cable 1 6 which is led thereover and connected to' a link ltsec iired' ili an eye :18 of a cap/=19 which is tightly 5 fitted within "and "riveted or otherwise secured to'the upperend of the tubularineniber 11; It is obviousth atflie memb TH when in.

@byggad its upper position, will move dowuwardlv by virtue of its potential energy and such downward movement may be limited by suiticient opposing force, as may result from a pull upon the cable 16. Thus the cable will serve to move the member 11 upwardly within the member l0 and a release or play upon the cable will allow the member 11 to drop to any relative position dependmq on the length of cable played out.

Although the member ll may be limited in its movement by a manipulation of the cable 16 it is desirable to provide an additional fixed stop to prevent the accidental. disengagement of thetwo members 10 and 11. I provide a stop for thispurpose which comprises a rod 20 axially disposed within the member 10 and secured to the bolt 13 at'the upper end thereof. This rod extends through the cap 19 which is movable longitudinally thereof. Thus the member 11 may iacive longitudinally of the rod which is provided with a nut 21 at its lower end to arrest the downward movement of the member 11. For the purpose of dissipating vibration due to an impact of the cap 19 upon the nut 21 I provide a resilient member such as the helical spring 22 disposed about the rod and between the cap 19 and the nut. 21. It will therefore be evident that when the member 11 is permitted totall to the limit of its downward movement the shock or jar which would otherwise be transmitted throughout the member and possibly disturb the position of the boom, will be appreciabl absorbed by the resilient member and any shearing force'that would otherwise be exerted upon the rivets or bolts, which secure the cap 19 to the member 11 avoided.

It will be understood that when the member 11 is in its lowermost position a sutiicient portion of its length remains within the member 10 to maintain a substantially uni form strength throughout the length ot the guide against lateral thrust.

Atthe lower. end of the member 11 I provide a plug or nose piece 23 which may be either permanently fastened to the member as by riveting or may be removably secured thereto as shown in Fig. 2. The means for holding the movable plug 23 in detachable association with the member 11 comprises a sleeve 24: diametrically disposed within the plug and in which are positioned two movable pins 25 and 26 normally urged toward the ends of the sleeve through the ei'tpansion action of a s n-inn 27 which is disposed between the inner ends ot the pins. The outer ends of the pins are of relati ely small diameter for a given portion of their lenfith and shoulders 28 and 29 are thus uroduced and the plug 23 is secured in the end of the member 11 by the disoosition of the reduced ends of the pins in diametrically oppositely positioned apertures in the member ll. The plug :23 is also provided with a shoulder 30 against which, the member ll contacts. I also provide the plug with an eye 31 for the convenient attaclunent of cable by means of which the end of the guide may be moved from its vertical position and so maintained tor the purpose oi driving; a pile at an angle.

Vhere desirable I may employ an cxtcn sion piece 32 which is preferably secured to the lower end of the member 1] by means of pins 25 and 26 by the same means as is employed for securing the nose piece 22% to the member 1] as above described.

For the purpose of associating my guide with a power hammer I provide one or more yolres or guide rings These rings are provided with projections 34 having bolt holes 35 thereiiu whereby the ringlrs may be secured to the hammer by tap bolts 36. The rings are preferably constructed of a strip o t metal which, in transverse cross section. is oi dish shape with its convex surface adjiu cent the gu de when the guide rings are posi tioned iillPl'GtLlfiUllCl. The peculiar shape of this ring permits its movement with the hammer longitudinally of the guide. it being evident that the rounded surfaces 37 will ride freely over any irregularities upon the surface of the guide. as for instance the lower end of the member 10.

In practice my guide is secured to the end of any suitable carrier usually a boom 38 (shown in dotted lines) which may be mounted on either a barge, vehicle or upon the ground; The usual tackle may be provided for elevating a power hammer which may comprise a reciprocable member carried in the usual casing. My guide may be secured to the upper end of the boom by a coupling 4]. The guide rings may then be disposed. about the guide and fastened to the hammer. The vertical movement of the hammer will thereby be i'naintained through out its entire travel and the hammer 40 may be raised to a suflicient height and a pile 42 positioned beneath the hammer in position to be driven into' the earth. As the pile moves downwardly the hammer follows in a. given path by virtue of its association with the guide.

It will be appreciated that when the distance between the end of the boom and the ground is varied the guide may be adjusted to increase or decrease its length. or if the earth in which the lower end of the guide is embedded is of relatively soft material the guide may enter to such a depth as may be necessary in which cases the guide may be readily adjusted and maintained in su h position.

My invention therefore provides a con venient and useful means for ,(fuiding the movement 0t an automatic hammer and it is obvious that it may be used in all cases ltlfi lltl where a hammer or other weighty body requires a guide between its point of suspension and the lower limit of its movement.

Although I have shown a preferred embodiment of my invention it is evident that many modifications may be made therein as for instance the guide may consist of a multiplicity of short sections which may be c01- la-psed, and it is to be understood that such and other modifications are to be considered within the spirit and scope of the appended claims. 7

What is claimed is- 1. A guide for power hammers comprising a plurality of concentrically positioned and adjustable members adapted to be held in difi'erent relative positions to vary the length of the guide.

2. A guide for a power hammer comprising a plurality of rigid members adapted for relative adjustment to vary the length of said guide, and means for limiting the relative movement of said members.

3. An attachment for a power hammer comprising a guide, means for associating said guide with said hammer, said guide having a plurality of nested tubular members, means for slidably attaching said guide to said hammer and means for limiting the relative movement of said members.

4. An attachment for a power hammer comprising a guide including a plurality of hollow members one movable within the other and means within the said guide for controlling the relative movement of said members.

5. An attachment for a power hammer comprising a guide, means for associating said guide with said hammer, said means comprising annular guide rings having flared edges to permit their free movement with respect to said guide.

6. An attachment for a power hammer comprising a guide consisting of a telescoping member, means for securing one end of said member to a boom and a removable nose piece disposed at the opposite end of said guide.

7. An attachment for a power hammer comprising a guide comprising a plurality of nested members, one of said members having a nose piece removably attached to one end thereof.

In testimony whereof I have hereunto set my hand.

TENGEL ANDERSEN. 

